Radio Antenna Tuning via Variable Reactance Impedance Matching
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Solution Overview
Problem
Existing multi-frequency wireless devices face performance compromises due to size and design constraints, leading to inefficient antenna performance across multiple frequency bands, resulting in signal degradation and bit errors.
Innovation Solution
A method and apparatus for radio antenna tuning that utilize a tunable matching network with a variable reactance element, controlled by a controller to generate smaller tuning steps, adjusting impedance to match phase and amplitude shift criteria, thereby reducing signal degradation and bit errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a simple circuit with fixed value components is used to improve power transfer, then power transfer efficiency is improved, but adaptability to multiple frequency bands deteriorates
Solution Approach 1:
The patent applies dynamics by replacing fixed value components with variable reactance elements that can be dynamically adjusted. The matching network includes variable inductance and capacitance elements controlled by control signals, enabling the circuit to adapt its impedance matching characteristics across multiple frequency bands while maintaining optimal power transfer efficiency for each band.
Solution Approach 2:
The patent implements parameter changes by varying the reactance values of the matching network components based on the operating frequency band. The controller adjusts the inductance and capacitance parameters dynamically, allowing the same circuit to optimize power transfer for different frequency bands (e.g., LTE, WiFi, Bluetooth) without requiring separate fixed circuits for each band.
2Volume of moving object
If antenna structure is compromised due to size constraints, then device compactness is improved, but antenna performance across frequency bands deteriorates
Solution Approach 1:
The patent uses dynamics to compensate for the compromised antenna structure by dynamically adjusting the matching network parameters. The variable reactance elements adapt the impedance matching in real-time to optimize the performance of the compact antenna across different frequency bands, effectively mitigating the performance degradation caused by size constraints.
Solution Approach 2:
The patent implements feedback mechanisms where the controller monitors the operating conditions and adjusts the matching network parameters accordingly. This feedback control ensures that despite the antenna being compromised for size, the system maintains reliable performance across multiple frequency bands by continuously optimizing the impedance match.
3Speed
If a single desired tuning step is applied to matching network, then tuning speed is improved, but signal degradation and bit errors increase
Solution Approach 1:
The patent applies segmentation by dividing a large desired tuning step into multiple smaller incremental tuning steps. Instead of applying one large adjustment that causes signal degradation, the controller breaks down the tuning into sequential smaller steps, each staying within acceptable phase and amplitude shift limits, thereby maintaining signal quality while still achieving the desired tuning destination.
Solution Approach 2:
The patent implements periodic action by applying tuning steps in a sequential, time-distributed manner. The controller applies multiple smaller tuning steps over successive time periods rather than one instantaneous large step, allowing the system to maintain signal integrity during the tuning process while progressively achieving the target impedance match.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient impedance tuning across multiple frequency bands, reducing signal degradation and bit errors by dividing the desired tuning step into smaller steps that satisfy operational criteria, ensuring maximum phase and amplitude shift limits are not exceeded.
Implementation Method 1
adjusting the timing of the tuning... A method and apparatus for radio antenna tuning that utilize a tunable matching network with a variable reactance element, controlled by a controller to generate smaller tuning steps, adjusting impedance to match phase and amplitude shift criteria
Data Source
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AI summary
A system that incorporates teachings of the present disclosure may include, for example, determining, by a controller of a mobile communication device, a phase shift criteria and an amplitude shift criteria associated with a modulation being implemented by the mobile communication device. The controller can determine a group of tuning steps that satisfies the phase and amplitude shift criteria and that provides a desired tuning step for a matching network of the mobile communication device. Additional embodiments are disclosed.